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Gun Caliber Conversion Chart
I refer to this often; thought y'all might be able to use it.
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Gun Calibers
510mm = 20.1"
460mm = 18.1"
457mm = 18.0"
445mm = 17.5"
420mm = 16.5"
412mm = 16.25"
410mm = 16.1"
406mm = 16.0"
381mm = 15.0"
380mm = 14.96"
356mm = 14.0"
350mm = 13.78"
343mm = 13.5"
340mm = 13.4"
330mm = 13.0"
320mm = 12.6"
310mm = 12.2"
305mm = 12.0"
300mm = 11.8"
283mm = 11.1"
280mm = 11.02"
270mm = 10.6"
265mm = 10.43"
254mm = 10.0"
250mm = 9.8"
240mm = 9.4"
234mm = 9.2"
229mm = 9.0"
220mm = 8.66"
210mm = 8.27"
203mm = 8.0" (7.99")
200mm = 7.9"
190mm = 7.5"
180mm = 7.1"
178mm = 7.0"
175mm = 6.9"
170mm = 6.7"
160mm = 6.5"
155mm = 6.1"
152mm = 6.0"
150mm = 5.9"
140mm = 5.51"
137mm = 5.4"
135mm = 5.3"
134mm = 5.25"
132mm = 5.2"
130mm = 5.1"
127mm = 5.0"
120mm = 4.7" - 50-pdr, 60-pdr
114mm = 4.5"
110mm = 4.3"
105mm = 4.1"
102mm = 4.0" - 25-pdr
100mm = 3.9"
94mm = 3.7" = 32-pdr
90mm = 3.5"
88mm = 3.46" - 15-pdr, 22-pdr
85mm = 3.3"
80mm = 3.1"
76.2mm = 3.0" - 12-, 13-, 14-, 16-, 17-pdr
75mm = 2.9"
66mm = 2.6" - 9-, 11-pdr
65mm = 2.56" - 9-pdr
60mm = 2.4"
57mm = 2.24" - 6-pdr
55mm = 2.17"
51mm = 2.0"
50mm = 1.97"
47mm = 1.85" - 3-pdr
45mm = 1.77"
40mm = 1.57" - 2-pdr
37mm = 1.46" - 1-pdr to 1.5-pdr
35mm = 1.38"
30mm = 1.18"
28mm = 1.1" - 1-pdr (U.S.)
27mm = 1.06"
25mm = 0.98"
23mm = 0.91"
20mm = 0.79"
18mm = 0.70"
15mm = 0.59"
14mm = 0.55"
13.7mm = 0.54"
13.2mm = 0.52"
12.7mm = 0.50"
8mm = 0.31"
7.7mm = 0.303"
7.62mm = 0.30"
6.5mm = 0.26"
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Nice list. I find it funny that a 7.7mm is listed as 0.303" while the 7.62mm is listed as 0.30".
I have a similar list as this on paper, allthough this list has quite a few extra caliber's. Thanks Swampy!, usefull post indeed.